Ammonia is one of the most produced compounds in the world and has been used in various fields. In addition, many research efforts have been made on hydrogen carriers, direct fuel cells, and the use of fuel in internal combustion engines. However, research on the ammonia spray characteristics as the basis for using ammonia in internal combustion engines has not been conducted. In order to use ammonia as a fuel, the shape of ammonia spray under various chamber ambient pressure conditions at a specific temperature was photographed by a schlieren and mie-scattering technique using a high-speed camera, and its characteristics were analyzed based on the results.Furthermore, the widely used fuels were sprayed under chamber ambient pressure conditions such as ammonia to compare the spray of ammonia. Experimental results show that the penetration length of the ammonia spray decreases when the chamber atmosphere pressure increases or the background temperature increases. When the chamber ambient pressure was much higher than the vapor pressure at a given temperature, the ammonia spray was flash-boiling and observed that each plume was injected as if it were coming out of one hole. Compared to methane spray, the ammonia spray shows a wider cone angle under the same conditions. Also, despite the fact that ammonia is a liquid in the injector when injected to CVCC, ammonia spray shows spray characteristics similar to methane fuels. Compared with the iso-octane spray experiment, ammonia showed faster evaporation than iso-octane under all pressure conditions.
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An Experimental Study on High-pressure Spray Characteristics of Ammonia by Using Schlieren & Mie-scattering Method
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